
4
Upgrading System Memory in Cisco 3600 Series Routers
78-3636-05
Memory Configurations
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Have the same access time (in nanoseconds).
• SIMMs in banks 2 and 3 must:
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Be the same size (in megabytes), and the same size as or smaller than those in banks 0 and 1
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Have the same access time (in nanoseconds)
Thus, only certain combinations of DRAM SIMMs are permitted:
• Combinations for 32-bit configurations used in Cisco 3620 routers are shown in Table 2.
• Combinations for 32-bit configurations used in Cisco 3640 routers are shown in Table 3.
• Combinations for 64-bit configurations used in Cisco 3640 routers are shown in Table 4.
Table 2 32-Bit DRAM Configuration for Cisco 3620 Routers
Bank 0 (SIMM 0) Bank 1 (SIMM 1) Bank 2 (SIMM 2) Bank 3 (SIMM 3) Total Memory
4 MB 4 MB 4 MB 4 MB 16 MB
4 MB 4 MB 8 MB —
8 MB 8 MB — —
16 MB — — —
4 MB 4 MB 4 MB 4 MB
4 MB 16 MB — — 20 MB
8 MB 8 MB 4 MB —
16 MB 4 MB — —
8 MB 16 MB — — 24 MB
8 MB 8 MB 8 MB —
8 MB 8 MB 4 MB 4 MB
16 MB 8 MB — —
8 MB 8 MB 4 MB 8 MB 28 MB
8 MB 8 MB 8 MB 4 MB
8 MB 8 MB 16 MB – 32 MB
8 MB 8 MB 8 MB 8 MB
16 MB 16 MB — —
16 MB 16 MB 4 MB — 36 MB
16 MB 16 MB 4 MB 4 MB 40 MB
16 MB 16 MB 8 MB —
16 MB 16 MB 4 MB 8 MB 44 MB
16 MB 16 MB 8 MB 4 MB
16 MB 16 MB 8 MB 8 MB 48 MB
16 MB 16 MB 16 MB —
16 MB 16 MB 16 MB 4 MB 52 MB
16 MB 16 MB 16 MB 8 MB 56 MB
16 MB 16 MB 16 MB 16 MB 64 MB
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